CHAPTER 10 SERIAL INTERFACE FUNCTION
User’s Manual U14492EJ3V0UD
474
10.3.7 Dedicated baud rate generators 1, 2 (BRG1, BRG2)
(1) Configuration of baud rate generators 1, 2 (BRG1, BRG2)
For UART1 and UART2, the serial clock can be selected from the dedicated baud rate generator output or
internal system clock (f
XX
) for each channel.
The serial clock source is specified with registers ASIM10 and ASIM20.
If dedicated baud rate generator output is specified, BRG1 and BRG2 are selected as the clock sources.
Since the same serial clock can be shared for transmission and reception for one channel, baud rate is the
same for the transmission/reception.
Figure 10-23. Block Diagram of Baud Rate Generators 1, 2 (BRG1, BRG2)
BGCS1, BGCS0
PRSCMn
Match detector
1/2
UARTn
8-bit timer counter
f
XX
/2
f
XX
/4
f
XX
/8
f
XX
/16
Selector
Remark
f
XX
: Internal system clock
n = 1, 2
